File:2020-12-03 10.42.41.jpg: Revision history

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3 December 2020

  • curprev 17:1217:12, 3 December 2020Dnevil talk contribs 188 bytes +188 Using a Sagitta Rule, Step 2: Read the radius of the rail from the Sagitta Rule. In this photo the rail has a curve approximating a 50 foot radius. Photo by Daris A Nevil, December 2020.